commit bc187d42b054fdcd06d8ab6ba262bc3bfd1cd71c Author: Isis Lovecruft isis@torproject.org Date: Fri Nov 23 05:41:44 2012 +0000

Added an exception catching wrapper for quick debugging, and added more documentation. --- ooni/utils/log.py | 19 +++++++++++++++++++ ooni/utils/net.py | 35 +++++++++++++++++++++++++---------- 2 files changed, 44 insertions(+), 10 deletions(-)

diff --git a/ooni/utils/log.py b/ooni/utils/log.py index 6f4622d..c751571 100644 --- a/ooni/utils/log.py +++ b/ooni/utils/log.py @@ -3,6 +3,7 @@ # :authors: Arturo Filastò # :licence: see LICENSE

+from functools import wraps import sys import os import traceback @@ -59,6 +60,24 @@ def exception(msg): def exception(*msg): logging.exception(msg)

+def catcher(func): + """ + Quick wrapper to add around test methods for debugging purposes, + catches the given Exception. Use like so: + + @log.catcher + def foo(bar): + if bar == 'baz': + raise Exception("catch me no matter what I am") + foo("baz") + """ + def _catcher(*args, **kwargs): + try: + func(*args, **kwargs) + except Exception, exc: + exception(exc) + return _catcher + class LoggerFactory(object): """ This is a logger factory to be used by oonib diff --git a/ooni/utils/net.py b/ooni/utils/net.py index 7c1c2a1..1814df2 100644 --- a/ooni/utils/net.py +++ b/ooni/utils/net.py @@ -104,7 +104,6 @@ def capturePackets(pcap_filename): reactor.addSystemEventTrigger('before', 'shutdown', stopCapture) return d

- def getClientPlatform(platform_name=None): for name, test in PLATFORMS.items(): if not platform_name or platform_name.upper() == name: @@ -113,7 +112,6 @@ def getClientPlatform(platform_name=None):

def getPosixIfaces(): from twisted.internet.test import _posixifaces - log.msg("Attempting to discover network interfaces...") ifaces = _posixifaces._interfaces() ifup = tryInterfaces(ifaces) @@ -121,13 +119,16 @@ def getPosixIfaces():

def getWindowsIfaces(): from twisted.internet.test import _win32ifaces - log.msg("Attempting to discover network interfaces...") ifaces = _win32ifaces._interfaces() ifup = tryInterfaces(ifaces) return ifup

def getIfaces(platform_name=None): + """ + Determines if the client's OS is Windows or Posix based, and then calls + the appropriate function for retrieving interfaces. + """ client, test = getClientPlatform(platform_name) if client: if client == ('LINUX' or 'DARWIN') or client[-3:] == 'BSD': @@ -142,8 +143,16 @@ def getIfaces(platform_name=None):

def checkInterfaces(ifaces=None, timeout=1): """ + Check given network interfaces to see that they can send and receive + packets. This is similar to :func:`getDefaultIface`, except that function + only retrieves the name of the interface which is associated with the LAN, + whereas this function validates tx/rx capabilities. + @param ifaces: - A dictionary in the form of ifaces['if_name'] = 'if_addr'. + (optional) A dictionary in the form of ifaces['if_name'] = 'if_addr'. + @param timeout: + An integer specifying the number of seconds to timeout if + no reply is received for our pings. """ try: from scapy.all import IP, ICMP @@ -180,6 +189,15 @@ def checkInterfaces(ifaces=None, timeout=1): raise IfaceError

def getNonLoopbackIfaces(platform_name=None): + """ + Get the iface names of all client network interfaces which are not + the loopback interface, regardless of whether they route to internal + or external networks. + + @param platform_name: (optional) The client interface, if known. Should + be given precisely as listed in ooni.utils.net.PLATFORMS. + @return: A list of strings of non-loopback iface names. + """ try: ifaces = getIfaces(platform_name) except UnsupportedPlatform, up: @@ -202,7 +220,6 @@ def getNonLoopbackIfaces(platform_name=None):

def getNetworksFromRoutes(): """ - Get the networks this client is current on from the kernel routing table. Each network is returned as a :class:`ipaddr.IPNetwork`, with the network range as the name of the network, i.e.: @@ -224,17 +241,15 @@ def getNetworksFromRoutes(): from scapy.all import conf, ltoa, read_routes from ipaddr import IPNetwork, IPAddress

- ## Hide the 'no routes' warnings - conf.verb = 0 - + conf.verb = 0 # Hide the warnings networks = [] for nw, nm, gw, iface, addr in read_routes(): n = IPNetwork( ltoa(nw) ) - (n.netmask, n.gateway, n.ipaddr) = [IPAddress(x) for x in [nm, gw, addr]] + (n.netmask, n.gateway, n.ipaddr) = [ IPAddress(x) for x in + [nm, gw, addr] ] n.iface = iface if not n.compressed in networks: networks.append(n) - return networks

def getDefaultIface():